Speaker unit



Sept. 17, 1929. a. F. GouDY SPEAKER UNIT Filed April 19,1928

- INVENTORQ. 65% v AQTTORNEY.

Patented Sept. 17, 1929 UNITED. STATES PATENT OFFICE CARL F. GOUDY, OF FLUSHING, NEW YORK, ASSIGNOR T PACENT ELECTRIC COM- PANY, INQ, OF NEW YORK, N. Y.,

A CORPORATION OF NEW YORK SPEAKER UNIT Application filed April 19,

Special objects of the present invention are to provide an operating unit for loud spealrers and the like, which will be powerful 1n its operation, and at the same time re-produce i faithfully, without distortion, which can be readily assembled and properly adjusted, and which will be particularly efiicient electrlcally and magnetically. V

The various novel features of construction,

combination and relations of 'parts by which the foregoing andother desirable objects are attained are set forth in the following speclfication. 7

' The drawing accompanying and formmg part of the specification illustrates one practical commercial embodiment of the invention, but it should be understood that the structure may be modified and changed without departure from the true scope of the mvention as hereinafter set forth and particu larly claimed.

Fig. 1 is a plan view of the complete un1t;\ Fig. 2 is a sectional view of the same as on Substantially the plane of line 2-2 of Fig. 1;

Fig. 3 is an end View of the unit with one s1 d e of the same shown partly in section; Flg. 4 is a deliail perspective view of the armature havi g the integral. mounting wings; Fig. 5 is a detail perspective view of one of the pole pieces.

The magnet of the unit deslgnated 7 1s shown as of the usual prominent horse-shoe type, but differs from the magnets customarlly employed in that it is faced off on one side to provide accurately finished smooth fiat .seats 8 for the pole pieces, and in that these flat pole tips are continuous and imperforate. The pole pieces 9 similarly have smooth finished flat imperforate faces 10 overlying and 4.0 fitting as absolutely as possible the flat polar seats on the tips of the magnets. By thls construction, drilling or punching of the magnet or pole pieces are eliminated, and continuous complete joints 'are ma de between the magnets and pole pieces eliminating magnetic losses. I a

For holding the ,pole pieces 1n place, a clamp construction is provided shown 1n the form of anonmagnetic bridge piecefll 09erstanding the pole pieces, and anon-magnetic- 1928. Serial No. 271,152.

clamp bar 12 of a rigid channel cross-section bridging the pole tips at the opposite side of same is shown as a substantially rectangular cross-section bar substantially the same width as the polar projections, and as long enough to bridge the forks of the pole pieces, and to provide a short thinned extension 20 to which thepin or rod 21 is attached as by being driven fixedly thereinto. the .pin 21 is soldered, or otherwise suitably secured as shown at 22 in Fig. 3 in the channeled portion of a spring strip 23, which is The outer end of secured by an integral spring hinge 24 and screw 25 to a mounting post 26. r This spring supported member 23 has attached to it the drive rod 27, which connects with the cone or other sound wave creating member.

Another special and important feature of the armature is that it is flexibly and resiliently mounted by means of integral side wings 28 springing from opposite sides of the same and flattened down as indicated in Fig. 4 to form spring supports. In practice, the armature member is usually blanked out of soft magnetic stock in a single piece with integral protuberances at opposite sides of line bar portion of the same, and then these protuberances are cold swaged to extend, fiatten, and jatthe same time harden them to a sufficient" extent to give them the desired spring quality all'this being effected without hardening the main bar portion of the armature.

The armature is mounted by gripping the side wings of the same, one in a clamp carried by the bridge or clamp member 11', and the other in a similar clamp-carried by a memher 29 lying between the legs of the magnet and secured in opposition to the member 11 by nuts 30 on the clamp screws 13. The two armature clamps are of similar construction, and. consist in each instance of a set screw 31, bearing on a shim 32, engaging the side Wing, the latter extending into a seat in the form of a slot 33 in the supporting member. These shims, it will be observed, provide wide gripping surfaces bearing flat on the side wings, overcoming anytendency to rattle, and serving to prevent the screws as they are tightened from exerting a twisting tendency on the armature wings.

The magnet winding is shown as made in two sections in the form of fiat coils 34: at opposite sides of the side wings, and surrounding the end portions of the armature bar. The terminals for this Winding are shown in the form of binding posts 35, Fig. 2 entered into open ended slots 36 in opposing flanges on the two members 11 and 29, and held tightly therein by the nuts 37. This construction permits of the binding posts being slid into place in these slots, and then secured by simply tightening screws 37.

The two members 11 and 29 are in themselves in the nature of a clamp gripping the opposite sides of the pole pieces as shown in Fig. 3 and enlarged as a more or less globular housing enclosing the magnetic winding, armature and polar projections. To more firmly secure the two parts of this housing together, the two through screws 38 are shown connecting the housing parts at one edge, and at the opposite edge these housing parts are indicated as held together by a cap screw 39 engaging over the companion tubular threaded extensions 40 of the two members. The slots 36 for the binding posts provide a cut-out portion at the top giving access to one end of the arma disclosed, the coil housing can be put together with the coils, the armature and the pole pieces all in place therein, and these parts can all be properly set and adjusted as a separate assembly, which when complete and in proper working order can be applied as a unit to the magnet. The cost of the magnet is materially reduced by avoiding any requirement to drill or machine the same,

seats, pole pieces having correspondingly smoothly finished continuous surfaces engaged with said pole seats and clamp means securing said pole pieces on said pole seats without passage of any fastenings through the permanent magnet, said clamping means including a coil housing bridging the pole pieces and a magnet winding in said housing.

2. A speaker unit comprising a permanent magnet having the polar portions of the same smoothly surfaced on one side and imperforate to provide accurate continuous pole seats. pole pieces having correspondingly smoothly finished contin'uous surfaces engaged with said pole, seats and clamp means securing said pole'pieces on said pole seats without passage of any fastenings through the permanent magnet, said clamping means including a clamp structure securing the pole pieces in properly associated relation independently of any means holding the pole pieces to the magnet.

3. A speaker unit comprising a permanent magnet having the polar portions of the same smoothly surfaced on one side and imperforate to provide accurate continuous pole seats, pole pieces having correspondingly smoothly finished continuous surfaces engaged with said pole seats and clamp means securing said pole pieces on said pole seats without passage of any fastenings through the permanent magnet, said clamping means including a two-part coil housing, a magnet Winding in said coil housing, an armature in the coil housing, the parts of said coil hous-- ing clamping the pole pieces and the winding in properly associated relation, and further having means for mounting the armature in proper relation to the winding and to the pole pieces.

4:. In a device of the character disclosed, a

5. In a device of the character disclosed, a clamp structure, cooperating pole pieces held in adjusted relation with said clamp structure, an armature for said pole pieces mounted in said clamp structure and positioned thereby in proper relation to the pole pieces, a magnet winding for said armature mounted in proper relation thereto in the clamp structure, apermanent magnet and means for securing the clamp structure with the parts thereby held in adjusted associated relation to the magnet as a single assembly unit, said latter means comprising a second clamp structure including in part portions of the first clamp structure.

6. In a device of the character disclosed, a

permanent magnet, a two-part clamp, pole pieces for the magnet secured in adjustable relation between the members of said clamp, an armature for said pole pieces, securing means carried by the members of the clamp for mounting said armature in adjustable relation to the pole pieces, a winding for the armature held positioned in proper relation thereto between the members of the clamp, and means for binding the assembled clamp structure in adjustable relation to the permanent magnet.

7. In a device of the character disclosed, a permanent magnet, a two-part clamp, pole pieces for the magnet secured in adjustable relation between the members ofsaid clamp, an armature for said pole pieces, securing means carried by the members of the clamp for mounting said armature in adjust-able relation to the pole pieces, a' winding for the armature held positioned in proper relation thereto between the members of the clamp, and means for binding the assembled clamp structure in adjustable relation to the permanent magnet, the latter means including a clamp bar and screw means for coupling said clamp bar to the first mentioned clamp structure.

8 In a device of the character disclosed, a two-part coil housing, pole pieces adjustably clamped between the members of said housing, an armature mounted in said housing in cooperative relation to said pole pieces, means for securing the members of the housing together at one end of the armature, and a cap screw for securing the members \of the housing together at the opposite end of the arma ture and adapted on removal to expose said opposite end of the armature. I

9. In a device of the character disclosed, a magnet having pole pieces, an armature for cooperation with said pole pieces, said armature having side wings by which the same is supported and clamps for 'adjustably securing 'said side wings, said clamps including shims bearing on the side wings and set screws engaging said shims.

""10. The method of forming an armature and an elastic mounting therefor which comprises blanking out an armature with in- ,tegral protuberances at opposite sides of the same and then swaging said protuberances to harden and thin the same into elastic side wings. i

11. The method of forming an armature and an elastic mounting therefor, which comprises blanking out an armature with an integral protuberance and then swaging said protuberance to relatively harden and thin the same into an elastic supporting wing.

12. As a new article of manufacture, a solid continuous one piece armature and mounting, soft iron having integral rolled, compacted, thinned, springy wing projections.

13. As anew article of manufacture, a continuous solid, one-piece armature and spring mount therefor, comprising an armature bar of soft iron having an integral compacted and thinned springy projection.

14. In a device of the character disclosed, a clamp structure, cooperating pole pieces held in adjusted relation with said clamp structure, an armature for said pole pieces supported by the clamp structure in position to properly cooperate with the pole pieces, a coil carried by the clamp structure in cooperative relation to the armature, a magnet and means for securing said clamp structure with the parts thereby held in adjusted associated relation to the magnet as a single.

comprising an armature bar of faces of the magnet and clamp bolts extending between said clamp bars at the front and back faces of the magnet to thereby solidly clamp the pole pieces over the front face of the magne 16. In a device of the character disclosed, a magnet having the polar portions of the same smothly surfaced on the front face and imperforate to provide smooth, accurate, continuous pole faces, pole pieces having correspondingly smoothly finished continuous surfaces engaged with the front pole faces of the magnet, a clamp bar overstanding said pole faces, a clamp bar overstanding the back faces of the magnet, clamp bolts extending between said clamp bars at the front-and backfacs of the magnet to thereby solidly clamp the pole pieces over the front face of the magnet and a securing member associated with said front clamp member for securing the pole pieces in spaced relation prior to the mounting of the same to the magnet.

17, In a device of the character disclosed,

a magnet having the polar portions of the same smoothly surfaced on -the front face and imperforate to provide smooth, accurate,

continuous pole faces, pole pieces having correspondingly smoothly finished continuous surfaces engaged with the front pole faces of the magnet, a clamp bar overstanding said pole faces, a clamp bar overstanding the back faces of the magnet, clamp bolts extending between said clamp bars at the front and back faces of the magnet to thereby solidly clamp the pole pieces over the front face of the magnet, the pole pieces being forked to provide spacedarms and the clamp bolts aforesaid extending through the spaces between said arms of the pole pieces.

In testimony whereof I aflix my signature.

CARL F. 'GOUDY. 

